Metal pipe laying

Metal pipe laying :Dark metal tube set should meet the following requirements: embedded in the wall in the middle of the metal tube diameter should not exceed 50 floors in diameter preferably 15 ~ 20MM, 30 meters straight piping design dark box . Laid in concrete, cement inside Hydraulic ferrules metal tube, the foundation should be solid flat .Metal pipe connections, holes should be aligned , joints should be tight, can not penetrate the water and mud .Metal pipe should be not less than 0.1 % of the drainage slope .Buildings between the metal pipe laying depth of not less than 0.7 m ; laying on the sidewalk below , should not be less than 0.5 m .